User manual HELIX HXA 400

[. . . ] You should be aware of the fact that such components may also be concealed in the double-skin trim panels/mouldings. The HELIX amplifiers may only be installed in motor vehicles which have a 12-volt minus pole connected to the chassis ground. Any other system could cause damage to the amplifier and the electrical system of the vehicle. The plus cable from the battery for the complete system should be provided with a main fuse at a distance of max. [. . . ] 9 - 12 Level controls for input sensitivity These controls can be used to match the input sensitivity of the individual channels - A to D - to the output voltage of the connected head unit. These controls are not volume controls and are solely intended for the purpose of sensitivity trimming. 15 - 16 Mono/Stereo Selector For switching the amplifier into 4 - channel operation mode both switches must be in stereo position. To use the amp in 3- channel mode (front / sub), the front channel has to be set in stereo and the sub channel to mono/ bridged. 1 Connecting the remote lead The remote lead is connected to the automatic antenna (aerial positive) output of the head unit (radio). This is only activated if the head unit is switched ON. Thus the amplifier is switched on and off with the head unit. 2 Connecting the ground cable The ground cable should be connected to a central ground reference point (this is located where the negative terminal of the battery is grounded at the metal body of the vehicle), or to a bright bare-metal location on the vehicle chassis, i. An area which has been cleaned of all paint residues. 4 Fuses The input fuses are connected in parallel and provide protection against an internal equipment fault, i. The system must be additionally protected by a further line fuse located in the vicinity of the battery (max. The fuse ratings are 2 x 30 amperes, and both must be installed as the amplifier protection rating is 60 amperes (2 x 30 A). 5 - 8 Signal inputs The HXA 500 MK II/HXA 500Q MK II have RCA connectors for cinch cables leading from the pre-amplifier outputs, the line outputs of the head unit or the outputs of a pre-amplifier/equalizer, e. These connectors are gold-plated in order to ensure better signal transmission. High power outputs of radios or similar units cannot be connected directly on the amplifier. 2 cinch leads connected), the inputs can be connected from A to C and from B to D by setting the selector switch to position 2. When the selector is set to position 1, all the inputs are separate. Connecting the remote lead Connecting the ground cable Connecting the battery cable Fuses Signal inputs Signal input selector Level controls for input sensitivity Speaker connection terminal for the subwoofer Setting the center frequencies Level control for raising the cut - off frequencies Band width adjustment Phase control CPS-Colour Protection System Bridged Selector 10 - 13 Level controls for input sensitivity These controls can be used to match the input sensitivity of the individual channels - A to D - to the output voltage of the connected head unit. These controls are not volume controls and are solely intended for the purpose of sensitivity trimming. the control range extends from 700 mV to 8 V. 14 Active low pass filter This control enables the frequency range of the integrated subwoofer amplifier to be infinitely variable from 50 to 250 Hz low-pass. 1) 15 Level control for the subwoofer amplifier This control enables the level of the subwoofer to be adjusted to requirements independently of the other channels. [. . . ] Incorrect adjustment of the parametric equalizer can have a considerable deleterious effect on sound quality. in such cases , consult your BRAX/HELIX dealer. If this is not immediately possible, turn controls 25 to 28 completely counter-clockwise so that the subwoofer amplifier operates in the linear mode. ; yellow (control 30) = the speakers wires are shorted to ground; red (control 31) = over heated. [. . . ]